Creating this No-Bake Raspberry Mousse Dessert is simple when you follow these straightforward steps:

1. Prepare the Raspberries: Wash the fresh raspberries gently and set aside.
2. Make the Raspberry Puree: In a blender or food processor, puree the raspberries until smooth. Strain through a fine-mesh sieve to remove seeds if desired.
3. Whip the Cream: In a large mixing bowl, whip the heavy cream with an electric mixer until soft peaks form. Gradually add the powdered sugar and continue beating until stiff peaks form. Fold in the vanilla extract.
4. Mix Cream Cheese: In another bowl, beat the softened cream cheese with an electric mixer until smooth. Add the Greek yogurt, lemon juice, and raspberry puree, mixing until well combined.
5. Dissolve the Gelatin: In a small bowl, sprinkle the unflavored gelatin over the cold water. Let it stand for about 5 minutes to bloom. After it blooms, heat it gently in the microwave for about 15 seconds until fully dissolved.
6. Combine Mixtures: Add the dissolved gelatin to the raspberry cream cheese mixture and stir well to incorporate evenly.
7. Fold in Whipped Cream: Gently fold the whipped cream into the raspberry mixture, being careful not to deflate the airy texture.
8. Transfer to Serving Dish: Spoon the mousse into individual serving dishes or a large bowl. Smooth the top with a spatula.
9. Chill: Cover and refrigerate for at least 2 hours, or until set.
10. Garnish and Serve: Once set, garnish with additional raspberries on top before serving.

Following these instructions will ensure that your No-Bake Raspberry Mousse Dessert is light, fluffy, and full of fresh raspberry flavor.